New Without Tags Brooks Brothers Blue Short Sleeve Oxford Cloth Button Down Popover.  A popover is a shirt with the buttons and placket going only part way down the front.  It is a very popular Trad / Ivy League style.  Size Medium Regent Fit (Slim), Measures 15.5 in the neck and 20.5 inches across chest at armpit level.

This is a Japanese market shirt and is a bit slimmer than a typical US market Medium

Tiny cut on shirt tail pictured.  Easy fix.

I combine shipping and pass the savings back to the buyer, so check out my other items on ebay.